@McDee flushing is where this went south. You are out of balance with too much P-K and it is locking out Ca, Mg and maybe others as well.
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Mixing only 1 gallon is difficult to get your nutrients in balance with that small amount so precision in measurements is important.
Get some soluble gypsum.
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Mix 2g Part A,
1g Epsom Salt mix well
then add a tiny amount of kelp, Humic Acid, mix well
then 1g gypsum. Nothing else! for next two weeks.
The Autowrecks I grew were especially sensitive to nutrient balance.